Chaotic and power law states in the Portevin-Le Chatelier effect

Details Chaotic and power law states in the Portevin-Le Chatelier effect Chaotic and power law states in the Portevin-Le Chatelier effect

2002-11-09

arxiv.org/abs/cond-mat/0211174v1

Europhys. Lett. \bf{60}, 234 (2002)

Physics

Condensed Matter

Materials Science

Published in Europhysics Letters

Scientific paper

10.1209/epl/i2002-00391-2

Recent studies on the Portevin - Le Chatelier effect report an intriguing crossover phenomenon from a low dimensional chaotic to an infinite dimensional scale invariant power law regime in experiments on CuAl single crystals and AlMg polycrystals, as a function of strain rate. We devise a fully dynamical model which reproduces these results. At low and medium strain rates, the model is chaotic with the structure of the attractor resembling the reconstructed experimental attractor. At high strain rates, power law statistics for the magnitudes and durations of the stress drops emerge as in experiments and concomitantly, the largest Lyapunov exponent is zero.

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